A teenager was shot and injured critically during a robbery in the Greater Grand Crossing area.

Chicago police said the 17-year-old boy was in an alley in the 6700-block of South Prairie at approximately 9:20 p.m. Tuesday night when the attacker shot him in both legs, took $500 from his pockets and ran away.

The teenager was taken in critical condition to John H. Stroger Jr. Hospital of Cook County, police said.